Improvement in watchmakers  chain-clamps



UNITED STATES PATENT OEEIcE.

CHARLES E. EVARD, OF LEESBURG, VIRGINIA.

IMPROVEMENT IN WATCHMAKRS CHAIN-CLAMPS.

Specification forming part of Letters Patent No. 143,131, dated September 23, 1873; application led August 5, 1873.

To all whom it may concern:

Be it known that I, CHARLES E. EVARD, of Leesburg, in the county of Loudoun and State of Virginia, have invented a new and Improved Chain-Clamp; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing forming part of this specification, in which- Figure lis a perspective view, and Fig. 2 is a side elevation.

The invention relates to a method of holding the steel chains used inside of watches when the same are undergoing repair by the expulsion of a rivet preparatory to the replacement of a broken link. Heretofore they have been held and handled with a pair of pinchers, and the rivet and broken link removed by prying the latter apartwith a screwdriver or other wedged-shaped tool, the chain being rst annealed.

It is found in practice that, not .only are great care and skill required to repair a chain in this way, but, by reason of the preliminary annealing, the chain is always weakest where it has been m'endech To obviate these difficulties I construct a clamp with two movable jaws A A, having elastic shanks a a, which are angled at the base al to form shoulders for the tenon a2 that fits the'vise or table which holds the clamp. B is a right or left hand screw, which brings the jaws together or separates them. C G are open and right angled recesses made transversely across the upper corners of the jaws, so as to make iiat horizontal surfaces cc that form the rest or anvil on which the chain is supported while the rivet is being driven out. The recesses O C are not of sufficient width to allow the jaws A A to come quite together, but necessitate an intervening vacant space, b, sufficiently large to admit of the easy passage downwardly of the rivet as it is punched out.

The operation is as follows: A chain, D, is lirst placed with the links fiat on the rest c c and clamped between the jaws A A, so as to bring the rivet in a vertical position over the open space b. The punch is then applied and the rivet readily expelled. By holding the chain immovable between my clamps A A the annealing which injures the link next adjacent to the brokenone and causes it to break read ily afterwards is rendered unnecessary.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

A watchmakers7 Chainelamp, provided with jaws A A, having recesses C O forming chainrest c c, as and for the purpose described.

CHARLES ED. EVARD.

'Witnesses SoLoN G. KEMoN, I. E. EVAED. 

